This method, which is also called PTP (Precision Time Protocol), can reconcile very different PLCs with great precision, but requires special hardware such as the EL6688 EtherCAT Terminal. For more accuracy, a process based on IEEE 1588 can be used. ![]() In distributed installations, this method is sufficient when all you want to do is compare data. The only option that’s left is therefore to use a reference clock and determine its offsets from the local clocks when timestamps are generated for the data to be aggregated.īut which reference clock should you use? In order to achieve medium accuracy very simply, you can use the (S)NTP service, which is free and installed on all Beckhoff devices. ![]() Unfortunately, the system clocks on the individual controllers cannot be simply adjusted to synchronize them, because this would impair the entire application. If such data is then aggregated for a centralized application like TwinCAT Scope, the central system has no accurate time reference. ![]() Unfortunately, the timestamps on the different devices cannot be generated uniformly. In larger installations with multiple controllers, certain data must often be stored on a central server so that the aggregated data can be subsequently analyzed. ![]() corrected time stamps for data records, e.g.
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